US6549549B2 - Method of stabilizing the wavelength of lasers and a wavelength monitor - Google Patents
Method of stabilizing the wavelength of lasers and a wavelength monitor Download PDFInfo
- Publication number
- US6549549B2 US6549549B2 US09/778,763 US77876301A US6549549B2 US 6549549 B2 US6549549 B2 US 6549549B2 US 77876301 A US77876301 A US 77876301A US 6549549 B2 US6549549 B2 US 6549549B2
- Authority
- US
- United States
- Prior art keywords
- wavelength
- laser
- filter
- photodetector
- monitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
- H01S5/0687—Stabilising the frequency of the laser
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1303—Stabilisation of laser output parameters, e.g. frequency or amplitude by using a passive reference, e.g. absorption cell
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
- H01S5/06837—Stabilising otherwise than by an applied electric field or current, e.g. by controlling the temperature
Definitions
- the invention is based on a method of stabilizing the wavelength of lasers and a wavelength monitor for regulating the wavelength of a laser, comprising an optical input, a splitter, a wavelength filter in one branch, and two photodetectors.
- FIG. 1 illustrates a wavelength monitor according to the prior art
- FIG. 2 illustrates the difference signal of a wavelength monitor
- a wavelength monitor 1 is schematically illustrated in FIG. 1.
- a beam splitter 3 is connected to an optical input 2 .
- the beam splitter 3 splits the light into two branches.
- the first output of the beam splitter 3 leads directly to a photodiode P 1 .
- the second optical output of the beam splitter 3 leads to the input of a wavelength filter 4 , whose optical output leads to a photodiode P 2 .
- the photodiodes the electrical connections of which have not been shown here, supply photocurrents.
- the photodiode P 1 supplies a constant reference current 11 relative to changes in the wavelength of the laser whose light is applied to the optical input 2 .
- the photo diode P 2 supplies a filter function 12 in dependence upon the wavelength.
- the two photocurrents are analyzed in respect of their difference or ratio and supply a function illustrated in FIG. 2 .
- the intersection point of these functions is set at the desired wavelength via the choice of filter and/or via the photodiodes gain. It is indicated in FIG. 2 that the wavelength of the laser can be adjusted by heating or cooling of the laser, whereby an intersection point not yet at the exact wavelength can be shifted.
- the reference current I 1 must supply a value such that the error signal becomes zero at the desired wavelength to be set or the ratio between the photodiodes currents reach the target value.
- the error signal is then used to operate the laser temperature control stage. If the wavelength drifts towards small wavelengths, the control circuit compensates for this by heating the laser. If the wavelength drifts towards a larger wavelength, the control circuit cools the laser.
- wavelength filters When a wavelength monitor of this kind is used for wavelength division multiplex transmission systems, it is effective to select wavelength filters with a periodic characteristic. It is known to user Fabry-Perot filters here. In the simplest case one uses, for example, fibre Fabry-Perot interferometers with an air gap as dispersive element. Due to the use of Fabry-Perot interferometers, the period of the interferometer can be selected to correspond to the wavelength pattern for the wavelength division multiplex. The error curve in the case of the use of such a periodic filter is illustrated in FIG. 3 . Here the error signal of a periodic wavelength filter is plotted over the wavelength.
- c is the light velocity
- n is the refractive index of the air
- I is the size of the air gap. If the free spectral region is now to be reduced, the size of the air gap I must simultaneously increase. Such an increase in size of the Fabry-Perot interferometer counters the endeavoured use of highly integrated, small systems.
- FIG. 4 thus shows the results of the use of the method according to the invention.
- the free spectral region is distinctly increased and at the same time the gain of the reference signal of the photodiode P 2 is varied. It is thus possible to arrange different wavelengths of the wavelength division multiplex on one edge of the periodic error signal.
- By adapting the electric gain of the photodiode P 1 it is possible to set any wavelength in the linear range between the gain regions G 1 and G 2 .
- This method according to the invention has the advantage that a high degree of integration can be achieved by reducing the air gap of the interferometer.
- the range in which a wavelength can be set is increased.
- the linear range is also expanded so that the problems associated with the mechanical positioning of the interferometer are reduced.
- the method can be easily adapted to different wavelength division multiplex channel spacings, for example of 100 GHz, 50 GHz or even 25 GHz.
- FIG. 5 schematically illustrates the construction of a monitor according to the invention.
- a laser 5 is connected to a temperature control stage 6 .
- the light of the laser 5 is applied to the input end of a splitter 3 .
- the light of the splitter 3 passes on the one hand to a photodiode P 1 and on the other hand via the wavelength filter to the photodiode P 2 .
- the photodiode currents are analyzed in a differential amplifier 8 , whose error signal 9 is applied to the temperature control stage 6 .
- the photodiodes are each operated by drivers 7 , the other electrical circuits having not been shown.
- the photodiode P 1 can be operated by a driver which internally supplies different drive voltages.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Semiconductor Lasers (AREA)
- Optical Communication System (AREA)
Abstract
Description
Claims (5)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00440041A EP1133033A1 (en) | 2000-02-09 | 2000-02-09 | A method of stabilizing the wavelength of lasers and a wavelength monitor |
EP00440041 | 2000-02-09 | ||
EP00440041.2 | 2000-02-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20020009104A1 US20020009104A1 (en) | 2002-01-24 |
US6549549B2 true US6549549B2 (en) | 2003-04-15 |
Family
ID=8174096
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/778,763 Expired - Fee Related US6549549B2 (en) | 2000-02-09 | 2001-02-08 | Method of stabilizing the wavelength of lasers and a wavelength monitor |
Country Status (3)
Country | Link |
---|---|
US (1) | US6549549B2 (en) |
EP (1) | EP1133033A1 (en) |
JP (1) | JP2001274506A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030108353A1 (en) * | 2001-10-09 | 2003-06-12 | The Furukawa Electric Co., Ltd. | Optical module, optical transmission apparatus, WDM optical transmission device, and method for stabilizing laser wavelength |
US20070223861A1 (en) * | 2006-03-27 | 2007-09-27 | Avanex Corporation | Multiport switch for optical performance monitor |
TWI453940B (en) * | 2007-12-25 | 2014-09-21 | Seiko Instr Inc | A light detection device, and a video display device |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009158569A (en) * | 2007-12-25 | 2009-07-16 | Seiko Instruments Inc | Photodetection semiconductor device, photodetector, and image display device |
JP2009158570A (en) * | 2007-12-25 | 2009-07-16 | Seiko Instruments Inc | Photodetection semiconductor device, photodetector, and image display device |
JP6241931B2 (en) * | 2013-12-27 | 2017-12-06 | 住友電工デバイス・イノベーション株式会社 | Control method of wavelength tunable laser |
WO2018081085A1 (en) * | 2016-10-25 | 2018-05-03 | The Regents Of The University Of California | Methods of diagnosis and treatment of alzheimer's disease |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4583228A (en) | 1983-11-21 | 1986-04-15 | At&T Bell Laboratories | Frequency stabilization of lasers |
EP0284908A1 (en) | 1987-03-30 | 1988-10-05 | Siemens Aktiengesellschaft | Arrangement to control or adjust an emission-wavelength and an emitted power of a semiconductor laser |
DE4119265A1 (en) | 1991-06-12 | 1992-12-17 | Ant Nachrichtentech | Laser transmission frequency stabilisation in fibre=optic network - by tuning, e.g. Fabry-Perot, filter between beam-splitters associated with laser-and filter-stabilising photodetectors |
US5798859A (en) | 1995-07-27 | 1998-08-25 | Jds Fitel Inc. | Method and device for wavelength locking |
-
2000
- 2000-02-09 EP EP00440041A patent/EP1133033A1/en not_active Ceased
-
2001
- 2001-01-30 JP JP2001021002A patent/JP2001274506A/en not_active Withdrawn
- 2001-02-08 US US09/778,763 patent/US6549549B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4583228A (en) | 1983-11-21 | 1986-04-15 | At&T Bell Laboratories | Frequency stabilization of lasers |
EP0284908A1 (en) | 1987-03-30 | 1988-10-05 | Siemens Aktiengesellschaft | Arrangement to control or adjust an emission-wavelength and an emitted power of a semiconductor laser |
DE4119265A1 (en) | 1991-06-12 | 1992-12-17 | Ant Nachrichtentech | Laser transmission frequency stabilisation in fibre=optic network - by tuning, e.g. Fabry-Perot, filter between beam-splitters associated with laser-and filter-stabilising photodetectors |
US5798859A (en) | 1995-07-27 | 1998-08-25 | Jds Fitel Inc. | Method and device for wavelength locking |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030108353A1 (en) * | 2001-10-09 | 2003-06-12 | The Furukawa Electric Co., Ltd. | Optical module, optical transmission apparatus, WDM optical transmission device, and method for stabilizing laser wavelength |
US7106978B2 (en) * | 2001-10-09 | 2006-09-12 | The Furukawa Electric Co., Ltd. | Optical module, optical transmission apparatus, WDM optical transmission device, and method for stabilizing laser wavelength |
US20070223861A1 (en) * | 2006-03-27 | 2007-09-27 | Avanex Corporation | Multiport switch for optical performance monitor |
US7760972B2 (en) | 2006-03-27 | 2010-07-20 | Oclaro Technology, Plc | Multiport switch for optical performance monitor |
TWI453940B (en) * | 2007-12-25 | 2014-09-21 | Seiko Instr Inc | A light detection device, and a video display device |
Also Published As
Publication number | Publication date |
---|---|
US20020009104A1 (en) | 2002-01-24 |
EP1133033A1 (en) | 2001-09-12 |
JP2001274506A (en) | 2001-10-05 |
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